<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <select name="like" id="mylike" onsubmit="btnClick()">
        <option value="hn">湖南</option>
        <option value="gd">广东</option>
        <option value="gx">广西</option>

    </select>
    <input type="submit" onclick="btnClick()">
<script src="./js.js"></script>
</body>
</html>